A Zn–PyBisulidine catalyzed asymmetricMannichreaction of 3-acyloxy-2-oxindoles has been developed. Various quaternary substituted 3-acyloxy-2-oxindoles bearing vicinal amino alcohol motifs were obtained in good to excellent yields with moderate to excellent dr and excellent enantioselectivities. The utility of this reaction was demonstrated by the easy removal of the acyl group to give C3-hydroxy
已经开发了 Zn-PyBisulidine 催化的 3-acyloxy-2-oxindoles 的不对称 Mannich 反应。各种四元取代的 3-acyloxy-2-oxindoles 带有连位氨基醇基序,以良好至优异的产率获得,具有中等至优异的 dr 和优异的对映选择性。该反应的实用性通过轻松去除酰基得到 C3-羟基衍生物及其作为配体关键骨架的应用来证明,用于 Ni 催化的对映选择性亨利反应。
High diastereo- and enantioselective Michael addition of 3-acetoxy-2-oxindoles with nitroalkenes catalyzed by nickel/PyBisulidine
A Ni/PyBisulidine catalyzed asymmetric Michael addition of 3-acyloxy-2-oxindoles to nitroalkenes has been developed. Various quaternary substituted 3-acyloxy-2-oxindoles were obtained with excellent yields and diastereo- and enantioselectivities in a low-toxic green solvent, ethyl acetate, with a low catalyst loading (1 mol%). The reaction process is air and moisture tolerant. The substrate scope was
作者:L. I. Mazhilis、V. N. Garalene、A. P. Stankyavichyus、S. P. Risyalis
DOI:10.1007/bf00767830
日期:1985.8
MAZHILIS, L. J.;GARALENE, V. N.;STANKYAVICHYUS, A. P.;RISYALIS, S. P., XIM.-FARMATS. ZH., 1985, 19, N 8, 960-964
作者:MAZHILIS, L. J.、GARALENE, V. N.、STANKYAVICHYUS, A. P.、RISYALIS, S. P.
DOI:——
日期:——
Cooperative Heterobimetallic Zinc/Alkaline Earth Metal Catalysis: A Zn/Sr Aminophenol Sulfonamide Complex for Catalytic Asymmetric Michael Addition of 3-Acetoxy-2-oxindoles to β-Ester Enones
A heterobimetallic zinc/strontium catalyst has been developed for the asymmetric Michael addition of 3-acetoxy-2-oxindoles to β-ester enones in high yields with excellent enantioselectivities and high diastereoselectivities. This process represents that 3-acetoxy-2-oxindoles can be used as a stable air- and base-tolerant precursor for chiral 3-substituted 3-hydroxy-2-oxindoles.